Elves- Believable Beasts

If Christmas is a holiday you celebrate, or even know about, you probably have a picture that just popped into your head. A jolly fat man with a white beard holding a list whos being followed by a bunch of tiny green elves. These creatures were created and came from a different origin though. They did not serve a jolly old man, they were originally small creatures who were invisible to the human eye, and liked to cause chaos.